Look at the knowledge of formatting, the earliest pages, and other things like the above link that show knowledge and background the person shouldn't have. I don't want to reveal more because I'm pretty sure that I worked with the person in the past.

So not only are they a sock, but they are trying to work on my articles?

He started well after I was banned, yet his edits are rather strange. I'm surprised none of the usual suspects has filed an SPI request against him accusing him of being me.

If he's competently working on the articles you've written, and also not causing the sort of trouble which for whatever reason tends to arise in your presence, then why would they want to CheckUser him?

So not only are they a sock, but they are trying to work on my articles?

He started well after I was banned, yet his edits are rather strange. I'm surprised none of the usual suspects has filed an SPI request against him accusing him of being me.

If he's competently working on the articles you've written, and also not causing the sort of trouble which for whatever reason tends to arise in your presence, then why would they want to CheckUser him?